For the 6th period, the principal quantum number is n = 6 The orbitals that can participate in filling for this period are: \[ 6s,\; 4f,\; 5d,\; 6p \] (filled in this order according to the Aufbau principle and \((n + \ell)\) rule).
Each type of subshell has:
Total electrons that can be successively added in these subshells: \[ 2 + 14 + 10 + 6 = 32 \text{ electrons} \]
Each new electron corresponds to a new element (new set of quantum numbers). Therefore, the number of elements in the 6th period equals the number of electrons that can be accommodated in \[ 6s,\; 4f,\; 5d,\; 6p \] i.e. \[ \boxed{32 \text{ elements}} \]
Given below are two statements:
Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.
Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.
In the light of the above statements, Choose the correct answer from the options given below:
The correct orders among the following are:
[A.] Atomic radius : \(B<Al<Ga<In<Tl\)
[B.] Electronegativity : \(Al<Ga<In<Tl<B\)
[C.] Density : \(Tl<In<Ga<Al<B\)
[D.] 1st Ionisation Energy :
In\(<Al<Ga<Tl<B\)
Choose the correct answer from the options given below :